FR49349E
Expired / Lapsed
FR
⏱️ 0.0 years remaining
Device for determining the permeability of soils
Assignee: Louis Georges Edouard Lefranc
•
Filing: 1938-04-05
•
Granted: 1939-02-17
•
Expires: 1958-04-05
Abstract
No abstract record available.
Inventors
- 👤 Louis Georges Edouard Lefranc
Bibliographic Details
Application Number
—
Jurisdiction
FR
Data Source
google_patents
Last Synchronized
2026-10-29 04:36
CPC Classifications
E; E21; E21B; E21B49/00; E02; E02D; E02D1/00; E02D1/02; E02D1/027; E21B33/00; E21B33/10; E21B33/12; E21B33/124; E21B33/1243
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.